I've never dealt with octopi but i had a spotted blue stingray many years ago and it was pretty easy keep. just make sure there is sand and alot, and i mean alot of room for it. they like to move around alot when not buried in the sand. and last thing, do not have any triggers with it of any kind or they will start to peck at the stingray's eyes when it tries to bury itself in the sand. that is my experience, hope it helps.